Use .manifest file for apps on Windows

Works with CMake, and also adds DPI awareness to DolphinQt2 (which
wasn't enabled before).

Source/Core/DolphinQt2/CMakeLists.txt

@@ -32,6 +32,10 @@ set(SRCS
 
 list(APPEND LIBS core uicommon)
 
+if(WIN32)
+	list(APPEND SRCS DolphinQt2.manifest)
+endif()
+
 set(DOLPHINQT2_BINARY dolphin-emu-qt2)
 
 add_executable(${DOLPHINQT2_BINARY} ${SRCS} ${UI_HEADERS})